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So, this is a new bike with 7-speed freewheel instead of freehub and cassette? Freewheels and anything 7-speed have been obsolete for about 25 years, certainly far before 29" bikes appeared. If you have a new bike with such components, it is likely to be extreme low end quality. With the new freewheel, it is also possible that the chain is already worn out ...


I'm betting that you need to install a brand new chain and a brand new freewheel / cassette, at the same time, and out of an abundance of caution, make sure they're the same brand. I doubt your friend actually ruined anything, the more likely scenario is that the chain is old and stretched, causing it to slip ( or it's the wrong length as Daniel mentioned ). ...

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